Process of etching rolls to mutually register



1 'rnoonss or nrcnme No Drawing.

so that theyfwill exactly register in multiple color or print work. i

In prior processes of making etchings on copper or other rolls for"multiple color or multiple print work, it has been found to bepractically impossible to secure-perfect regis try,due"t;o shrinkage,stretching and Warping of the sensitive sheets of paper used. In suchprocesses the necessary use of photography hasintroduced extra expense,delays, and inaccuracy of reproduction.

' This invention has for an object the pro.- vision of processes ofetching rolls which will secure'perfect and accurate registry. It

has for an object also the avoidance of photographic methods and the useof sensitized sheets of carbon or'other paper. Another object of theinvention is to secure better working and printing qualities in therolls. Ajfurther object is toetchrolls in such a manner that theprinting will be sharp and certain in effect. a

The invention accordingly broadly comprises a process of etching rollscomprising "the'steps of'transferring to'colorrolls by shallowetching, adesign conta1n1ng registry marks from a key ormaster roll, supplying'thecolor rolls with removable coatings,

removing portions of the coatings registered with the design to be incolor, etching the rolls'and removing the coatings.

7 {Althoughthe invention may assume various specific forms andmodifications, as defined in the claims, the following constis *tntes apreferred embodiment thereof.

I I A key or master roll, preferably of copper, is etched to produce thedesired design or picture in its predominating tones, and registry marksare placed thereon at the four edges of the design. The key or masterroll is placed on the usual press and a sheet of "unstretchable ordinarywhite paper' s 1mw. SAAL-IBURG, or NEW YORK, NL'Y., ASSIGNOR 'ro..THE'rRIsMATo1\fE" oo.,;

live, or NEW YORK, N. Y., A co trorte'rron .0E '-11\TEW.Y0RK,:,5

Specification of Letters Patent. P a ten tdzliebi 21, 1922 Applicationfiled marry 15,1921. "Serial 1105443191, 1?

pressed "by the roll usage. geekyin The.

whole wet surface onthe paper is covered with a colored "powder,preferably red chalk, which is then dusted efrea ruuy with/a dustingbrush-the m n i e P wder ee: l

to the'wet ink;

The copper rolls to be usedvfor'colors are next prepared, one roll beingused forjeac'h color. The rollis' placed onthe press, poli- Romsenemas-Reese.

ished and heated, and a solutionof 'any hot wax such, 'for examp1e-,--as beeswaxfis rolled over'the whole surfaceofthe roll in a very even andthin coatings The-roll'is dried and the above prepared sheet of paperwith the chalk is fed-into the press so that it'is offset on to thesurface off'the roll with'the result that the chalk only comesfoif andadheres to the roll. The picture fromthe-mas'ter roll will appearplainly on thetallow surface of f the color roll, whilethedifi'erentregister marks will beplainly seen thus forminga' perfectguide for registering the colored designs. The registering 'marks jaregout through onto the colorroll withafine needle or other point andtheroll is then' etched with ferric "chloride. 71 The etching must bevery shallow or just enough to show where the picture belongsontherollfiI An impressionis n'o'w' taken with-light blue inkor other lightinkfromthe' keyor master roll on very thin'paper 'having 'a 'fine roughrear surface, on paper'bem used for each color roll. The color roll isnow again heated and a solution of beeswax, containing rolled with aclean {rubber roller "over; the color roll until the surface isco'veredas thinly hardening r l suchjas asphalti' m, is

as possible. When'dry, the thin paperfwhich has'been' printed from thekey-roll is stuck on to the color roll withthe rough graining in contactwith the roll and with the registry marks I correspondingto the marks;'on' the copper colorl roll. In case "the paper=-is opaque, the registrymark'scan be cutout so that themarks on therollcan be; seen; The artistnow draws upon this paper, "with-a pencil. or"pointedtool','the designto be in color. -This: process is repeated foreachcolor roll, threecolors being generally needed; As a result, the'coatingris removed wherethe pencil comes in pressure contact 'therewith through. the paper,-sothat-the etching liquid may. attack the. copper. 1 1: The rough back ofthe paperprovides forzthe v, and also longer printing life oftheetching.

necessary graining so that numerous dots will appear on the coating andthe corresponding particles. .of coating removed will stick to thepaper. Having removed the paper, the roll is treated with the etchingliquid whereby an etchedinipressionof the desired color is obtained inperfect registry;

fl h tolors may; generally be red,"blue and yellow, andthejpredomiiiating tone brown and black; but these (301cm may, ofcourse, be'variedy or the various prints may be in the; or nearl similar'color, sin ce the of color isf not of importance. 1 hatever 'colors areused perfect registry will be bbtained sothatjthere will notbe any overrrli tf e .1? 010. 3 III the P its h f @Q fif 1 en r lly Pr n e firetroll printedlast.

and thepredominating tone from the master lt svill; e; err rentthat, ythe s of the'prp e s e ath s. in i i t yp e r t y obt ned e e n, the vri s Pr rolls; and thatall photographic methods have 'b een inj etchingthe various rolls. llhe process provides for za fine, grain 'gin thetchings ajnchby the use of the etched ,rollse sharp and definite'printmaybe obtained, V V

'As many apparentlywidely different embjodimen'ts of the invention maybe devised andlf'have described only. one preferred .erne bojdiinent,\it is understood that "I do not limit rnyself Ttolthe details ofthisem'bodi- ,rrient, eXcep'ti'as indicated in the appended Iclafim'a V""l lfheprocesszof etching rollsvto secure registry,flcomprising thesteps of transferring-to a rollbyvshallow etching a vdesigncontaining-fregifstry marks from a master roll :supp1ying the formerroll with a re- 'movable coating, removing portions of the coating toregister with the design :to' be 1-printed in 'colorporother,wise,ietching the rolls, and removing the coatings. V

2. The: process of etching rollsto secure are ist -com risin therste sof transferring to; color rolls 'by'shallow-etchinga de- 's1gncontaining registryimarks from avmas terjro'll, supplying the colorrolls with re Fmovable coatings,'-securing thereon in regjistry' thinsheets having impressions of the design, drawing the color designon thesheets,- etchin'gftherolls and removing the coatings.

3. The process of etching rolls to secure registry comprising the stepsof transferring to Color rolls by shallow etchinga design froin'a'masteror key roll provided with registry marks, printing thin papers havingrough, near surfaces from the key roll, placing them in registryon thecolor rolls "prepared by coating them with a removable coating, drawingthe color design on the paper, etching the color rolls, and finallyremoving the coatings.

4. The process ofetch ing copper rolls to register in 7 color workcomprising the steps 7 of transferring to color rolls shallow etchingdesign coiit'ainingi regi stry marks from a key 'roll, supplying thecolor rolls with removable coatings, removing. portions of thecoatingsfby-pressiire throughl'a rjegistering' paper print [ofjlthe keyroll, said portions registering with'the design to vbefiin color,etching the rolls'and removing-the CQ ig -V i r y The process 'ofetching rolls to;v register incolor work 'coiiiprising the st ps oftransferring to color rolls by'ishallow etching ]a design fro t key rollhaving registry marks, priiitiiig lthin papers rearsurfaces from thekeyfrolll, placing them in registry on? color rolls coated with;a'removable c aangdmwi g the 1 1 ;1-e d 1asign on jthel I); per, etchingthe} color rolls, and finallyremoving meanings. I

7 6. ,The process of. etchi copperjrollslto register in color work,comprising the steps of makingan impression on a paper'from a key rolletchedin the predominating'tones and registry marks, transferringthe'paper I impression to an impressionable removable coating on oneormore color rolls and markcolor rolls very slightly, printingfthin; pa-

fing registry marks onthe latten etching the :ershavin a rou h rearsurface from the 7 key roll, placing them'in registrygop the color rollscoated with arem able coating,

drawing the colored design on the paper, and 7 then etching the rollsand finally removing the coa ngs a a V a .f .7 7. 'The process ofetching copper rolls to register in color work, comprising thejsteps ofetching a key roll in the predominating tones, with registry marksthereon, printing 'sheetsof unstretchable' paper from this key roll:with a sticky ink, dusting, ajcolored powder onto the ink, feeding thepaper olnto a copper, color roll prepared by drying thereon a thin, evencoat ofa tallow containing composition, whereby an impression, of thekey roll wlth lts registry marks 1s made in the composition on the colorroll, marking the figure in the color roll, etching the roll only veryslightly, printinga thinpaper containing a composition capable of re-'the registry impressions and main lines of i 8. The step in the processof etching rolls to secure exact registry comprising transferring adesign from a master roll having registry marks to another roll by veryshallow etching of the latter roll.

9. The steps in the process of etching rolls to secure exact registry,consisting of transferring a design from a master roll having registrymarks to an unstretchable sheet of thin material, making a very shallowetching in another roll from this sheet, and making another etching uponthe roll for the color or print to be produced thereby.

10. The process of claim 1 with the added step of first placing a finegrain over the rolls.

11. The process of claim 2, with the added steip of first placing a finegrain on the ro ls.

12'. The process of claim 3, with the added step of first placinga finegrain on the rolls. a

13. The process of claim 4, with the added step of first placing a fine,grain on the rolls.

rolls.

' 15. The process of claim 6, with the added step of first placing afine grain onvthe rolls.

16. The process of claim 7, with the added CHARLES w. SAALBURG.

